1. I go to see the doctor because I am very ill. a)must b) must to c) have to
2. You wear a uniform to school.
a) should
b) have to c) must
3. I
go home now. My dog needs walking and feeding.
a)have b)mustn't c) have to
4. You always pay the bills(crera) on time.
a) must to b) must c) should
5. You burn fires in the forest.
b) have to b) mustn't c) must
6. I visit my sister tonight. I haven't seen her for ages.
a) must to b) must
c) should
7. You cross the road when the red light is on.
c) have to b)shouldn't c) mustn't
8. You attend the lectures to pass the exams.
d) have to b) should c) have
9. I think you
thank your dad for your birthday present.
e) have to b) must c) should
10. Jack lives far from the office, so he to take a bus every day to get there.
a) Has b) must c) have​

1. I go to see the doctor because I am very ill.
- Correct answer: b) have to
Explanation: In this sentence, the phrase "have to" is used to express obligation or necessity. When you are very ill, it is necessary to go see the doctor.

2. You wear a uniform to school.
- Correct answer: b) have to
Explanation: Wearing a uniform to school is a requirement or rule, so the correct phrase to use here is "have to."

3. I go home now. My dog needs walking and feeding.
- Correct answer: a) have
Explanation: In this sentence, the verb "go" is used to express an action that needs to be done. Therefore, the correct phrase to use is "have" to indicate that it is necessary to go home.

4. You always pay the bills on time.
- Correct answer: c) should
Explanation: The phrase "should" is used to express advice or a recommendation. It is recommended to pay bills on time, but it is not an absolute necessity like "have to" or "must."

5. You burn fires in the forest.
- Correct answer: b) mustn't
Explanation: The phrase "mustn't" is used to express prohibition or something that is not allowed. Burning fires in the forest is not allowed for safety reasons, so the correct phrase to use here is "mustn't."

6. I visit my sister tonight. I haven't seen her for ages.
- Correct answer: b) must
Explanation: In this sentence, the phrase "must" is used to express strong necessity or obligation. It indicates that it is highly necessary or important to visit the sister since there hasn't been any contact for a long time.

7. You cross the road when the red light is on.
- Correct answer: c) mustn't
Explanation: The phrase "mustn't" is used to express prohibition or something that is not allowed. Crossing the road when the red light is on is not allowed for safety reasons, so the correct phrase to use here is "mustn't."

8. You attend the lectures to pass the exams.
- Correct answer: a) have to
Explanation: Attending lectures is necessary in order to pass the exams. The phrase "have to" expresses obligation or necessity.

9. I think you should thank your dad for your birthday present.
- Correct answer: c) should
Explanation: The phrase "should" is used to express advice or a recommendation. It is recommended to thank your dad for the birthday present, but it is not an absolute necessity like "have to" or "must."

10. Jack lives far from the office, so he has to take a bus every day to get there.
- Correct answer: b) must
Explanation: In this sentence, the phrase "has to" is used to express strong necessity or obligation. It indicates that it is highly necessary or important for Jack to take a bus every day in order to reach the office due to the distance.